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December Normals for Waltham, MA

< November January > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 26 43 35 0.13 30 0 2 26 43 34 0.13 31 0 3 25 42 34 0.13 31 0 4 25 42 33 0.13 32 0 5 25 41 33 0.12 32 0 6 24 41 33 0.12 32 0 7 24 41 32 0.12 33 0 8 24 40 32 0.12 33 0 9 23 40 32 0.12 33 0 10 23 40 31 0.12 34 0 11 23 39 31 0.12 34 0 12 22 39 31 0.12 34 0 13 22 39 30 0.12 35 0 14 22 38 30 0.12 35 0 15 21 38 30 0.11 35 0 16 21 38 29 0.11 36 0 17 21 37 29 0.11 36 0 18 20 37 29 0.11 36 0 19 20 37 28 0.11 37 0 20 20 37 28 0.11 37 0 21 19 36 28 0.11 37 0 22 19 36 28 0.11 38 0 23 19 36 27 0.11 38 0 24 18 36 27 0.11 38 0 25 18 35 27 0.11 38 0 26 18 35 26 0.11 39 0 27 17 35 26 0.11 39 0 28 17 35 26 0.12 39 0 29 17 34 26 0.12 39 0 30 16 34 25 0.12 40 0 31 16 34 25 0.12 40 0 Month 21 38 30 3.63 1101 0 Data Controls Monthly: January February March April May June July August September October November December   | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather